checked baby buns weight

I weight rosie and smokey this morning, when I got them they were both 445g, since then rosie is only 489 but smokey is 539, should I be concerned that he is gaining more than she is, or is this normal for boys to grow bigger quicker.

When Grace had her babies and I weighed them, Hope was a lot bigger than her Sisters and Brothers at 5 weeks old she was huge compared to the rest

I just went out to feed them again, and he is deffo pushing her out, we are going to try and clear another bit in teh shed and seperate them today, they will need to be parted very very soon as he might start to mate with her in next few weeks, I am worried they will get cold and lonely tho, so will have to go out more often and spend more human time with them like we do with charlie, since they wont have each other for company, 1 cage is solid plastic sides the other is wire so cant even put the cages right up to each other so they can still lean on each other or smell the other.